Hi Chris, On Sat, Feb 18, 2012 at 03:51, Chris Dashiell <cdash...@odu.edu> wrote: > I just wanted to let you know the numbers I got on a 32 core server. > > 1 thread: 3280 ms > 4 threads: 2665 ms > 8 threads: 2976 ms > 16 threads: 2878 ms > 32 threads: 2714 ms
We just checked on a 24-core server (2 physical processors of 6x2 cores each). We also get strange results, notably: the 1-thread performance is often *better* than the 2-threads performance. We tried to use "taskset" to constrain which cores run the two threads, trying notably to keep them on the same physical processor in order to minimize inter-processor traffic, but the resulting performance numbers make no sense at all. For example with "taskset -c 0,2,3" it is much faster than with any 2-numbers-only combination of 0, 2 and 3, which makes no sense because it's only running 2 threads... Armin _______________________________________________ pypy-dev mailing list pypy-dev@python.org http://mail.python.org/mailman/listinfo/pypy-dev
